Paper or plastic? When it came to cups the answer was always “both” since you didn’t have a choice.
Now we do.
So the main goal here is to make plastic, carry-out lids obsolete.The design has flaps similar to takeout cartons that fold over to seal in cold or hot beverages, while creating a sipping spout. See their site for a quick animation.
This is the kind of brilliant rethinking of everyday objects that makes me think we might evolve out of this chemical swamp we call home.